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Related Concept Videos

Hormonal Regulation of the Menstrual Cycle01:22

Hormonal Regulation of the Menstrual Cycle

The ovarian cycle regulates endometrial changes throughout a single menstrual cycle via the coordinated action of gonadotrophin-releasing hormone (GnRH) and gonadotrophins.
At puberty, GnRH begins a pulsatile release pattern, which triggers the anterior pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). The frequency and amplitude of GnRH pulses vary across the menstrual cycle, with faster pulses favoring LH release and slower pulses favoring FSH release.
Hormonal Regulation01:33

Hormonal Regulation

The renin-aldosterone system is an endocrine system which guides the renal absorption of water and electrolytes, thus managing blood pressure and osmoregulation. Activation of the system begins in the kidneys with a small cluster of cells adjacent to the afferent and efferent blood vessels of the renal corpuscle. As the nephrons are filtering blood, juxtaglomerular cells monitor blood pressure. If they detect a decrease in pressure, they release the hormone renin into the bloodstream.
Hormonal Regulation01:40

Hormonal Regulation

Hormones regulate a significant portion of digestion through activation of the neuroendocrine system. The neuroendocrine system of digestion contains many different hormones all with multiple functions that are both, directly and indirectly, involved in digestion.
Infertility in Females01:28

Infertility in Females

Female infertility is defined as the inability to conceive after a year of regular, unprotected intercourse and affects about 10–15% of couples worldwide. The primary cause of female infertility is ovulatory disorders, which hinder the release of eggs. These disorders can be classified as hypothalamic amenorrhea, polycystic ovarian syndrome (PCOS), premature ovarian failure, and hyperprolactinemic anovulation disorders.
Endometriosis, a condition characterized by abnormal growth of endometrial...
Hormones of the Pituitary Gland01:27

Hormones of the Pituitary Gland

The small, pea-sized pituitary gland is located at the base of the brain. It is crucial in regulating various bodily functions, from growth to reproduction. The gland is divided into the anterior lobe and the posterior lobe. The secretory cell clusters in the pars distalis of the anterior pituitary lobe are controlled by hypothalamic regulators and synthesize six primary hormones.
The most abundantly secreted hormone from the anterior lobe is the growth hormone, which controls overall growth by...
Gonadal and Placental Hormones01:24

Gonadal and Placental Hormones

The gonads, namely the testes in males and the ovaries in females, are pivotal in producing gonadal hormones that orchestrate the intricate processes of sexual development and reproduction.
In males, testosterone is the primary gonadal androgen. It plays a central role in the maturation of male reproductive organs — the penis and testes. Additionally, testosterone is instrumental in the development of secondary sexual characteristics — a deep voice as well as facial and pubic hair growth — and...

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Related Experiment Video

Updated: May 30, 2026

Rodent Estrous Cycle Monitoring Utilizing Vaginal Lavage: No Such Thing As a Normal Cycle
09:05

Rodent Estrous Cycle Monitoring Utilizing Vaginal Lavage: No Such Thing As a Normal Cycle

Published on: August 30, 2021

Support for human estrus: documentation in Ayurveda.

Kalanghot Padmanabhan Skandhan1, Achuthan Rajahariprasad, Balakrishnan Sumangala

  • 1Department of Physiology, Sree Narayana Institute of Medical Sciences, Eranakulam, India. kpskandhan@gmail.com

The Journal of Sexual Medicine
|August 13, 2011
PubMed
Summary

Human estrus, a rarely discussed topic, is explored in ancient Ayurvedic texts and supported by limited modern research. This study finds ancient writings on human estrus align with current scientific findings.

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Performing Vaginal Lavage, Crystal Violet Staining, and Vaginal Cytological Evaluation for Mouse Estrous Cycle Staging Identification
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Published on: September 15, 2012

Related Experiment Videos

Last Updated: May 30, 2026

Rodent Estrous Cycle Monitoring Utilizing Vaginal Lavage: No Such Thing As a Normal Cycle
09:05

Rodent Estrous Cycle Monitoring Utilizing Vaginal Lavage: No Such Thing As a Normal Cycle

Published on: August 30, 2021

Performing Vaginal Lavage, Crystal Violet Staining, and Vaginal Cytological Evaluation for Mouse Estrous Cycle Staging Identification
09:01

Performing Vaginal Lavage, Crystal Violet Staining, and Vaginal Cytological Evaluation for Mouse Estrous Cycle Staging Identification

Published on: September 15, 2012

Area of Science:

  • Reproductive Biology
  • Anthropology
  • History of Medicine

Background:

  • Human estrus is a poorly understood phenomenon with limited scientific literature.
  • Ancient Ayurvedic texts, such as the Susruta Samhita (1st century BC), contain discussions on human estrus.

Observation:

  • This study investigates the concept of human estrus as presented in the Susruta Samhita.
  • Modern scientific literature is reviewed to find supporting evidence for the ancient descriptions.

Findings:

  • The ancient text Susruta Samhita describes aspects of human estrus.
  • Limited modern research, though scarce, provides evidence that aligns with the descriptions found in the ancient text.

Implications:

  • This research bridges ancient wisdom with modern scientific understanding of human reproductive physiology.
  • Further research into human estrus may uncover new insights into reproductive behavior and endocrinology.